Trained dogs have been known to detect cancer, diabetes, and even COVID-19 by sniffing a person’s breath, urine, or skin. They can pick up on the unique scents emitted by specific illnesses, often before symptoms appear.
Dogs can hear higher frequency sounds than humans, between 40 Hz to 60,000 Hz (humans hear between 20 Hz to 20,000 Hz). This allows them to detect noises that are inaudible to us, such as ultrasonic sounds or distant high-pitched noises.